日志文件解析实例

package com.umge.civony.log.file;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ActionLog {
	public static void main(String[] args) throws IOException {
		// copyFile("d:/a.log.old", "d:/b.log");
		new ActionLog();
	}

	private final Pattern p;

	private void parserLine(String str) {
		Matcher m = p.matcher(str);
		if (m.find()) {
			for (int i = 1; i < m.groupCount(); i++) {
				// System.out.println( i + " = " + m.group(i));
			}
		} else {
			if (!str.startsWith("\t") && !str.endsWith("NullPointerException")
					&& str.length() > 10)
				System.out.println(str);
		}
	}

	public ActionLog() throws IOException {
		String regEx = "([\\d]+) ([\\d|:]+) (.+) - (.+)\\((.*)";
		p = Pattern.compile(regEx);

		FileInputStream fi = new FileInputStream("d:/a.log");

		BufferedReader in = new BufferedReader(
				new InputStreamReader(fi, "utf8"), 1000);

		String dataline;
		while ((dataline = in.readLine()) != null) {
			this.parserLine(dataline);
		}
	}

	public static void copyFile(String source, String dest) throws IOException {
		File oldf = new File(source);
		File newf = new File(dest);
		if (oldf.exists()) {

			if (!newf.exists()) {
				File parent = new File(newf.getParent());
				try {
					parent.mkdirs();
				} catch (Exception ex) {
					ex.printStackTrace();
				}
				newf.createNewFile();
			}

			FileInputStream fr = new FileInputStream(oldf);
			FileOutputStream fw = new FileOutputStream(newf);

			byte[] cbuf = new byte[1000];
			int i = 0;
			while ((i = fr.read(cbuf)) != -1) {
				for (int j = 0; j < i; j++) {
					if (cbuf[j] == 13) {
						cbuf[j] = 20;
					}
				}
				fw.write(cbuf, 0, i);
			}
			fw.close();
		}
	}

}